This is a very sad and ongoing problem.
Totally unnaceptable behaviour on the part of Sony.
There are others here who are having the same problem.
Basically the 'LIMITED EDITION' version of the game has the first wave of PSN Pass codes and the TMB code.
These have now expired as in went out of date.
I think Sony's logic is that after a year the game will have had a severe price markdown justifying buyers picking up the pass from the PSN network again even though it is technically inside the product you just bought.
This should be heavily advertised on the box imo.
For those wanting to get a new sealed game you should look for the version that DOES NOT come with TMB.
I'm pretty sure this version will have an up to date PSN Pass in the box.
On a related note, EA did this with their earlier Network Pass games as well:
http://www.cinemablend.com/games/EA-Says-Some-Online-Passes-Supposed-Expire-37500.html
